The brain is the center of the nervous system in all vertebrate and most invertebrate animals—only a few invertebrates such as sponges, jellyfish, adult sea squirts and starfish do not have one, even if diffuse neural tissue is present. It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste, and smell. The brain of a vertebrate is the most complex organ of its body. In a typical human the cerebral cortex (the largest part) is estimated to contain 15–33 billion neurons, each connected by synapses to several thousand other neurons. These neurons communicate with one another by means of long protoplasmic fibers called axons, which carry trains of signal pulses called action potentials to distant parts of the brain or body targeting specific recipient cells.
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Some articles on brain:
... of neuroscience Early philosophers were divided as to whether the seat of the soul lies in the brain or heart ... Aristotle favored the heart, and thought that the function of the brain was merely to cool the blood ... of medicine", came down unequivocally in favor of the brain ...
... in African countries, the health systems have been severely affected by brain drain, so various measures have been suggested and tried to limit the migration of ... cultivate a sense of security and hope among the elite to curb brain drain because people are not so confident of their countries' future ... And in India, although suffering severe brain drain every year, the Indian government has not to adopted strict policies because they believe that the overseas talent will eventually ...
... He studied the instrument under Aubrey Brain, father of Dennis Brain ... by Thomas Beecham to play second horn to Dennis Brain in the Royal Philharmonic Orchestra, and when Brain left for the Philharmonia, Civil took over leadership of the section ... In 1955, Civil joined the Philharmonia himself, becoming principal horn player when Brain died in a car crash in 1957 ...
... Human capital flight, more commonly referred to as "brain drain", is the large-scale emigration of a large group of individuals with technical skills or knowledge ... Brain drain is usually regarded as an economic cost, since emigrants usually take with them the fraction of value of their training sponsored by the government or ... Brain drain is often associated with de-skilling of emigrants in their country of destination, while their country of emigration experiences the draining ...
... Neuroscience and brain imaging has shown increasing potential for helping science understand happiness and sadness ... findings that depression can be diagnosed very accurately just by looking at fMRI brain scans ... scientists may be able to use methods like brain scans to tell us more about all the different ways of being "happy" ...
More definitions of "brain":
- (noun): Someone who has exceptional intellectual ability and originality.
Synonyms: genius, mastermind, Einstein
- (noun): The brain of certain animals used as meat.
- (noun): That part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord.
- (noun): That which is responsible for one's thoughts and feelings; the seat of the faculty of reason.
Synonyms: mind, head, psyche, nous
- (verb): Hit on the head.
Famous quotes containing the word brain:
“I dont know but a book in a mans brain is better off than a book bound in calfat any rate it is safer from criticism. And taking a book off the brain, is akin to the ticklish & dangerous business of taking an old painting off a panelyou have to scrape off the whole brain in order to get at it with due safety& even then, the painting may not be worth the trouble.”
—Herman Melville (18191891)